Richard Terrell's skin turned red and swelled up after he got J&J's COVID-19 vaccine.
His doctors say they believe it was directly caused by the vaccine.
But they said the reaction was "extremely rare" and encouraged people to still get the vaccine.
Richard Terrell of Goochland, Virginia, told the news station that he started experiencing the symptoms about four days after the getting the single-shot vaccine.
"I began to feel a little discomfort in my armpit and then a few days later I began to get an itchy rash, and then after that I began to swell and my skin turned red," Terrell told WRIC.
The rash proceeded to spread over his entire body, causing his legs and arms to swell and his skin to peel off, he said.
Insider has contacted Johnson & Johnson for comment.
"It was stinging, burning, and itching," Terrell told WRIC. "Whenever I bent my arms or legs, like the inside of my knee, it was very painful where the skin was swollen and was rubbing against itself."
According to WRIC, the rash first prompted Terrell to visit a dermatologist, who told Terrell to immediately go to the emergency room.
Terrell went on to spend five days at VCU Medical Center, where the rash was treated and doctors biopsied the rash to see what caused it, WRIC reported.
His doctors say the vaccine is still safe
One of Terrell's dermatology doctors at the hospital, Dr. Fnu Nutan, told WRIC that they determined the vaccine had caused an "extremely rare" reaction. Nutan said the doctors had ruled out the possibility of other viral infections, COVID-19 itself, and kidney and liver issues.
Nutan said she believed there's something about Terrell's genetic makeup that made him react this way to the vaccine, according to WRIC.
Nutan told WRIC that Terrell's experience shouldn't stop others from getting the Johnson & Johnson vaccine, which the US Food and Drug Administration has said is safe and effective.
There haven't been similar reports of severe reactions to the Johnson & Johnson vaccine, which was authorized for use in the US at the end of February.
It has in fact been reported that the Johnson & Johnson vaccine may be the superior vaccine of those given the OK in the US so far, since it requires only one shot, is proved to work against some of the new variants, and appears to have milder side effects compared with the Pfizer-BioNTech and Moderna vaccines.
'I wouldn't hesitate to get it'
Those who get the vaccine should simply monitor any possible reactions and go to a hospital if they experience something similar, Nutan told WRIC.
Nutan said Terrell's rash could have been life-threatening, but only if left untreated.
"If you look at the risk for adverse reaction for the vaccine, it's really, really low," Nutan told WRIC. "We haven't seen a great concern at all. I am a big proponent of the vaccine."
Terrell said he was still glad he got the vaccine.
"I wouldn't hesitate to get it," he told WRIC.
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